Hello, thanks for asking but I'm not sure what you mean. I showed the top and bottom l, what are exactly looking for and I will be happy to add it. ?

Hello, thank you for the advice. The aluminum foil is the capacitive sensor. It is capacitance to read the amount of water in the bowl. I will be doing more tutorials soon with the other functions but I'm really busy so I may be a few weeks. But stay tuned because I will be posting them.

No I just etcheched the paint away. All the copper is still there. At least my Lazer engraver was not powerful enough to engrave the copper. So I still needed to watch the copper. Hope that's understandable.

Hello, thank you for the comment. The RCA jack isn't a standard jack it has weird colors so i just connected them the right way to the AMP running my whole house audio. The volume control controls every audio output on the board. And also, I like your ideas to use the board with.